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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b1b6aded1697812e53320e7471984b38ca0b0c6058a8472cfa5022ea8036d1' 
  AND token = 'oN6IaUNA1ZpnYygq8NoFkUynCx3pNtH/MopQ5oX3et0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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