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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b619b3a8f41a0cc099feaa7881d0dc77ceb2ef6f20975a525e7b223e661927fa' 
  AND token = 'qSSFXhT80bsJfWHaptZ7Cv08efmLxioFJaYczBh4+Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}