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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4622af4c48bd309f1f62b9827e9e4cff5a0d470017946cc497bfd6210d30c3f6' 
  AND token = 'V9TrU7L9xCteew20yLSSpvscGlnOQn+uk0iM/JGEQVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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