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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa78b2fedbd335a3627d8ae3c97f5d63506f28c200ea0c0c1f452a15aadb618d' 
  AND token = '2ACHAD/lM24wnrUbI3T/BX6y9Ck599wyoRH91dtD8jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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