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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc1ca74a2989e051af461b3247079f0971b02c1580df852954102d59484c205' 
  AND token = 'W+7hNXrHgrj2Jtm6isZ/n8GTQkUc/ab9/sP7QQvt7n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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