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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f98e543e7aa1efcecfc7590c7c78abf6d1ff134a88a40ca30a8948646160ed' 
  AND token = 'pSzS+9CbiE/FEgMBmpZ8qrowPPW/nRzwEns7DWklrNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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