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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69172acd1b3c8ffd19db7e3160c45b053b83ae9118f9ffb8580e0463d4f47c5a' 
  AND token = 'bJ57O5TCTA4eWLOvDp63bVw8BpVRY9/vvIgRH56LJSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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