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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b98c065126acf03a2fd1f99b9c52a8831d9a0c42db38b69fcea568d00138784' 
  AND token = 'bd5BheeFqZfEzoznzIAUt5/cr/czWJ33Wiq51iMkDtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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