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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fdb14622595e32b544e7715fefb1b81322aab91de7818ab90b4be1de1b1fdee' 
  AND token = 'gM2A1uYBzhHK5mEQ2XqdkwTeNrs2ZaI9KGMUKpfAsfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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