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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e8d0b2bacb8920381a93ecdc6317284f55fd3ec6c37565f8b29d26d517d600' 
  AND token = 'eeBnO6KjNN9LKMxU1pjhKrNfwnkf8TM2peOaTeGSgLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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