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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f087f8d336ef57d9e3440809f2039b30c38f4fb13383da1e38637b90b81ecb93' 
  AND token = 'yacnRav7ONFXjvacnLGzr6m4oOChn9qS4ihvcMIjIxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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