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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcea1038076f46d87a8faf75d17c1a6a7ea334fb6bb66c0a28e9561de3a07b7' 
  AND token = 'ULM7rwibgNcnFgrOekan2RQ9l1KBlDa6/j6ixsUsE6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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