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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef37d6a1f18c1e9a6420f856ea60a63165722c055ed7fb0e3c4a5e6cfc4e68a' 
  AND token = 'N//fIAAhm5K+5vJfBn30mofZMaktyULfHHGfPfp6rds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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