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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04c6ae99df8e5327b1672a3e19aa00713cfb4cefb9fe865347d6ff967f3500b' 
  AND token = 'D+JZVMP/ueP9MO5ulWzzt3XJDFYpIDkCko0NMGlVgno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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