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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6169a3da0443aa013970a3587fe420cac804b3847477102b86bc711adac9dd' 
  AND token = 's0hMapVej7aZki22i62Cqlj2Xnnv1sdRBqwaJpE95hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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