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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba903d5f842da70e4180f207feeab3ea37af0f8d11447a00f4f39e853d8e067e' 
  AND token = '/V8M/RyVy71TX98oFz7JKjF9oXFpbppE+AIHtauGx/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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