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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5645afecc81ea1776a71b96ffa56ce2fe34f7706b811ef1835904f27b7d7d48b' 
  AND token = 'us7mNM6CnxpdU8PyhNYecKZNUEuUZis7oKtcsp6Xd+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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