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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d02d6ca70f277bd0e56d8e01d7ec9e9b2a0c5489ae0dd2f753d3aa8fd028242' 
  AND token = 'cfJ/YrLeuhlLHIu3CcZIN1WJbDqtA/rBwV+1Tmnyk70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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