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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819aa85ba8ae33bd6c6416cea0e832d95cdcf22d665c7705926a9fcef8ef79c6' 
  AND token = 'rxLKfVIH+SweKKIQkir7PFbwFho+03i9YOgEZPhyv1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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