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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d5900bd44143c51c0c4ac170d118a32b964cc1e1a143c8d1e433464461cdac' 
  AND token = 'vRa824v05eRKbu/weCaVEV/5PQLO9J7+cz4rljQIqrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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