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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30d52d81858c15aed909e8e74b69d843e46e8cd30db8cd04e76469b5ce50bfb' 
  AND token = 'rpwHASQCralRw6h+L3FGYhfVU0ni2HUjgq8EYoZfdWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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