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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50884f20f801cb94835ba96a51b1de80c0fdd3ec875fe4b4e8d47d8588927ec' 
  AND token = 'fQob/KIUE6mQlNlMJU3/IMJNGNlNZsOVvtybiWY0f3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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