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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6f7dbe8350d88170cff621254d9d9c547be4172e5f7bde0b81423f4b6564d5' 
  AND token = 'CQnM0AJphkxKLSLaHrLMokeKU+Tz2Bv2N+84C2QSxA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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