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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462cae58ff26982b26f63d4c1f10ed94c933438c21b7643af1c45d7e0918e595' 
  AND token = 'W2kO9Rv+qJtSte3TSIBwGTM4N2omyh++gQa+NPbUvbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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