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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2a9561650062004b0e969e68e7ed40e4ad0b2dff220e40211f886b960d39d9' 
  AND token = 'aPa0bpgPuvQt312FNaPqde/ggHOS4zIMQK9M0MPymDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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