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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad04cde37bb0ef9a144b0bb2de3813f5b1a98425eab77fd07177bc0ae4ea1c9' 
  AND token = 'aHviwUVI4R+2ZbVpAL7LV2eokm2er+6+0a/SWNVkZxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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