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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefe12f148c60071605c0cb19641132ff9409728dac2f9122c4d68f6c0ab1210' 
  AND token = 'qMLGFMK4td2xcxdHIEwjST9sVLWrcPFBAN/PGBu7Cfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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