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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119b4a263bf366d66120e50f79ddfbcbb0fea59f1c116e601d3b09122452195a' 
  AND token = 'p9HI224GdK5mzA7ZN7dPTk+Dgic3s/pTqB6/XOc7e4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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