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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9562b4329bae8479bd1bd3d96d11e33b1113b662b72625645b4db64f50e79517' 
  AND token = '1Rtx1rM4vgS42S0/bZsl75TvfJw067qbZEQlr0UvHAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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