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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fed7326d7962164e4768042dbb43daabe5a6433e1f32133100ada22c423f7e' 
  AND token = 'g+kQYjHLO3Jpda/IV4eUuiNfZ9xsblU4oZv3zP6f5Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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