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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3542572f32e399cf3bdc02a276fe955566dbdb05dd4b60a1bfcd92a5530255ae' 
  AND token = 'VCiCf8TXrF3UGChhh00/XRTVFQvdNe4rQcPYBH/UQQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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