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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22d99977ed802078232929ed627b1f69a3391f091dd940f6af5125e8856ff36c' 
  AND token = '0b+QdNFAbp+vpciJF1K55AyoJji6ah2zHJdajVf7q88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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