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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9ab6bce99276a0ae51eacecfa72fe89409ca7cf3713c0a3bcaefe8c2ea208e' 
  AND token = 'RQSdYjSEvHtWVjT+9o1uyvqCN+21PwTH9CfT3RPrLgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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