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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1fb544d19937d9bf6d385166bdbe6ef9e27932c0a61669a71ace63777bcb73' 
  AND token = '7bVPwG24eKbisn0ob2Om29jAxDIhif7sH++a7c5BHLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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