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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '181219dd397d6372e7f8e6f97e093f0601d389f2bfa6d03e6b36f317047b3d44' 
  AND token = 'NbNkNRQuCjBqq5WCvtHS92ea6DjcXSXWSPZcB73GKU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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