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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205bfe70b30f4d65e8bfa5ab7b4fb09c979fc582a1958bf93e4c2a58313e35f4' 
  AND token = 'Xd3JiX1spNe0U5tXi7g2xgBhLtNOuqSUfsehYi37jt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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