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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c300ef0d76b113a74e55c9bb890924d30f3ae3beb53c7301e1dde585287970' 
  AND token = 'evSwaXM7jKlla4eHX7HuED7ud5v25BfCUKu7tBAaVAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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