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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572bebb7394c972f55de8233841906c2d1883e767ba9d496670d37d9e9b39757' 
  AND token = 'TS989hEmSX0VybMWGHATxq+0R/nrsRqjlsJ3rCoV4TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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