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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95711749b57208d7c22a151320fccfb01f659c45da7db588af438d8b938491d1' 
  AND token = '5/Qxs7dFBWUWOe34ooVUFJDhbNNxnn+dDrrxUZLT0HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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