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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb28755830083f03c3cc8f92fe18e2b1a519a09e1dbfc3496154017cc07865ee' 
  AND token = 'dw4/ws3nrWuTQjyEtGIJjyHMsmnBKVIe8l6QhUncbf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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