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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcec3e349531ae223a60629cd12531d22866d2dafa9ff1aff95b61f71f6a8c1' 
  AND token = 'ULX3A1qI/c76f+fL9fBHcE7XDs8PsHYX33BwFucWInw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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