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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203c7f9d63f94ee4787e4c03479768ffcce7b36f337a727bba13cff9e7a819e3' 
  AND token = 'nEHzNowbwi60ooxxIsOrI8DXtX5y9oo4zJI/597T2lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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