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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c710e20c72607ad685740dbddc834146bce4afefb53932f5226f4d11555728' 
  AND token = 'E2a+EDI7+4zJbpml6HmFBLhL5KCl5anliiY1GSTsihk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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