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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ee8409dab3b65386f10e373909a291c5bb5c9fe7b79b876657b64797d97539' 
  AND token = 'b6gf+Vn6h6l7cJrP7y0BR10Ve6YGjXkNFbfElmAX76E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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