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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e7902cabad3908955b33a71421c120ea47aca5179ecf67007a911248014d8f' 
  AND token = 'UHs0Vve/7u6Tomwtx88cXei7+K2agbYWvDGRY1EU2No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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