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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac65c5a530bcde723aae15ecb5e89a5ee4d6606a7cc18479b5e136fd6e531b6' 
  AND token = 'YNKKRnwksnFX8oOUnvBUQsiIUT/MLyF8oXYOZegE2so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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