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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fb06307c5b61621961fb9243ffee4f166ea76c9a4bf2914dcbb6cb690817e9' 
  AND token = 'XZi47U81Ng3PsLeigr42RqYAIb5hgSvTfX9dYN71VVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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