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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4963eab27a72ca62629f4db37bc2ce6759e8430d8aac871bf3026a8825306b1b' 
  AND token = 'Bu3kU1wE8zkatfjz/kylnt8bATZtui27V5iYpI2tZDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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