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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d2775dbd42d7931847037ee2e190e431c8618dfced2c790d01f322e7056e43' 
  AND token = 'S3CMN/NErBu3vqcdVQq28+IhL/MM+xY2Q0PjjPU9mfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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