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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec853099fba5579e00ac49a32a355d3603fba67d94b024bea870a113874469ca' 
  AND token = 'xfq8iNI+MxOMOHucnF2XBjmA2ER0T3O6405Fmzf9osM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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