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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d172139eed4449cfdde0f6952bf78fa9e6ddbdc83937890aea3fee351ad4b04' 
  AND token = 'mdfiZINGt2wYhKMpNxm7s6DPPYb3w/xxmUH7RkWESKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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