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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe9e2f940a7da43d2dfdd56edfb73983715e3e9280d07bb0b7dee8d466801b5' 
  AND token = 'Wz1vpECdKcdghIlqcF4wxuOfzLgTukr74RE4dbK2qgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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