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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8274cf8e0c2dfc61d536d79bb01919f6c8593ed2fef91e2ebc943afb2e2ff941' 
  AND token = '351vCILcuKrKgmQnmeRmyFtC83R5JvMTl9DYql1HmU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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