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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39093624ddc3c87ea4cb1ee46c58db1d73c26fb0c9ede3f50d2556fc63fcd391' 
  AND token = 'iyJ/r11GKxM1gLp7/J2FHpI4clDCKrsUvrd5X0SbhJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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