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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aa0ea3c223eb3c96feb2ebce9d1a3a17247a23767a9d1968c47bede6faf4f0' 
  AND token = 'sm4G+O/fTmVON8bUJAP31saspWdsjcUwLwxbxhK1BAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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