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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14e057b31626d13872866a3c726dd6fb1616ddf53b23e578bcbfb6cd913ab88' 
  AND token = 'CZF7qW6TcZVbhofNsnyp31K40zws6O7fEDAkT7VOT+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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