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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5b3a68ab4eee4fb0d4f6dd9e11715ddb35a25fac8cdf4bf45c50e4cb47cc7e' 
  AND token = 'E2UTj8zftj8RgHP1QeTGXTr4RnoPvSfcEIf5rhEkE7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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