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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728fcd99294609390698c830c5012c98c2468c8d38de1d9a6ae0b7928a377853' 
  AND token = 'vUaXoQBePHSFHt69jDoP2G8nAz4QZ1oKkGkfYwD4vao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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