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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2acdcbd83afe85c1423923664d738e9d674faf748190bda3b5a14a42502bab' 
  AND token = 'RUdcDV4NDAVgt0A2z4Mvu4MwM84h4qJ4AX+4jbe+x/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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