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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19a0671ff6957d4ae38951f739fb4fde07579f816fe508c4ded2ade9f74304c' 
  AND token = 'UwKPHEWhB3+ASEQsf0ms2LjeFaKFgyslkrSF56YVBPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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